Adds fopen(), fwrite(), fclose()

tests.asm

@@ -23,6 +23,10 @@ extern	strclr
 extern	strlclr
 extern	strcat
 extern	strcmp
+;file.asm
+extern	fopen
+extern	fclose
+extern	fwrite
 
 section	.rodata
 	PRINT_nums	equ	1
@@ -42,6 +46,7 @@ section	.rodata
 	TEST_tolower	equ	1
 	TEST_toupper	equ	1
 	TEST_strcmp	equ	1
+	TEST_file1	equ	1
 
 	num1		dq	69
 	num2		dq	0xFFFFFF
@@ -141,6 +146,16 @@ section	.rodata
 	msgStrcmp4	db	"TEST strcmp(str4, str1): %d",NL,EOS
 	msgStrcmp5	db	"TEST strcmp(str1, str4): %d",NL,EOS
 	msgStrcmp6	db	"TEST strcmp(str1, str1): %d",NL,EOS
+	; fopen(), fwrite(), fclose()
+	testFile1	db	"testFile1.txt",EOS
+	fileStr1	db	"Hello file world!",EOS
+	fileMode_w	db	"w",EOS
+	msgFileB	db	NL,"# fopen(), fwrite(), fclose()",EOS
+	msgFileB1	db	"TEST fopen('testFile1.txt', 'w'): %d",NL,EOS
+	msgFileB2	db	"TEST fwrite(filePointer1, fileStr1): %d",NL,EOS
+	msgFileB3	db	"TEST fclose(filePointer1): %d",NL,EOS
+section .data
+	filePointer1	dq	0
 section .bss
 	strBuff1	resb	32
 	strBuff2	resb	8
@@ -712,6 +727,37 @@ main:
 	lea	rdi, [rel msgStrcmp6]
 	call	printf
 %ENDIF
+%IF TEST_file1
+	lea	rdi, [rel msgFileB]
+	call	puts
+
+	; TEST: fopen()
+	lea	rdi, [rel testFile1]
+	lea	rsi, [rel fileMode_w]
+	call	fopen
+	mov	r15, rax ;store filepointer to R15
+	mov	rsi, rax
+	xor	rax, rax
+	lea	rdi, [rel msgFileB1]
+	call	printf
+
+	; TEST: fwrite()
+	mov	rdi, r15
+	lea	rsi, [fileStr1]
+	call	fwrite
+	mov	rsi, rax
+	xor	rax, rax
+	lea	rdi, [rel msgFileB2]
+	call	printf
+
+	; TEST: fclose()
+	mov	rdi, r15
+	call	fclose
+	mov	rsi, rax
+	xor	rax, rax
+	lea	rdi, [rel msgFileB3]
+	call	printf
+%ENDIF
 
 	leave
 	ret